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Fixed Lens Mounts![]()
LMR2 Shown with a LMR1S SMR05 Shown with LMRA10 LMRA5 LMR05 Shown with LMRA6 Adapter Small Optic Adapters Mount Small Optics in Larger Diameter Mounts LMR1V Related Items ![]() Please Wait ![]() Click to Enlarge Fixed Lens Mount Comparison Fixed Lens Mounts Feature Internal Threads and a Retaining Lip (MLHx, LMRx), Internal and External Threads (LMRxS), or Internal Threads (SMRx) ![]() Click to Enlarge LMRA Series Adapters for Mounting Small Optics Features
Mini-Series Fixed Lens Mounts with Internal Threads (MLHx Series) Fixed Lens Mounts with Internal Threads (LMRx Series) Fixed Lens Mounts with Internal and External Threads (LMRxS Series) Fixed Lens Mounts with No Retaining Lip (SMRx Series) Small Optic Adapters This page also features alignment plates for simple beam alignment, threaded retaining rings, and spanner wrenches for easy optic installation. Thorlabs' Threading SpecificationsThorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.
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These Mini-Series Fixed Lens Mounts are compact, lightweight mounts for seven distinct optic diameters ranging from Ø5 mm to Ø1/2". Each mount features internal threading and ships with a retaining ring for securing an optic into place. The internal threading is deep enough to hold most unmounted optics or externally threaded components. The base of each mount features an 4-40 (M3) tapped hole, which allows for easy mounting to Ø6 mm Mini-Series posts, as shown to the right. Additional retaining rings are sold separately below.
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These Fixed Optic Mounts are our standard mounts for 20 distinct optic diameters ranging from Ø5 mm to Ø4". Each mount features internal threading, and ships with a retaining ring for securing the optic into place. The internal threading is deep enough to hold most unmounted optics or externally threaded components. The base of each mount features an 8-32 (M4) tapped hole, which allows for easy mounting to Ø1/2" Posts, as shown to the right. Additional retaining rings are sold separately below. Three of our most popular fixed optic mounts, the LMR05(/M), LMR1(/M), and LMR2(/M), are available individually and in packs of 5. 5-packs include one retaining ring per mount for a total of five rings.
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These vacuum-compatible fixed lens mounts are fabricated from unanodized 6061-T6 aluminum and are suitable for vacuum chamber and clean room applications. Each of these fixed lens mounts features a hole in the back which is connected to the 8-32 (M4) tapped mounting hole on the base in order to serve as a vent, allowing trapped gas to escape when a vacuum chamber is pumped down. This vented mounting hole allows for easy integration with our vacuum-compatible Ø1/2" posts. Do not plug this vent hole or attempt to use it as a mounting point. These lens mounts are available for Ø1/2", Ø1", and Ø2" optics and each one is shipped with a vacuum-compatible retaining ring for securing an optic against the retention lip at the back of the mount. Vacuum Compatibility Our vacuum-compatible lens mounts and included retaining rings are packaged in double airtight bags for cleanroom and vacuum chamber applications.
![]() ![]() Click to Enlarge SM1D12C Iris Shown with an SM1L10 Lens Tube that Has Been Mounted to an LMR1S Mount
These fixed lens mounts, which feature internal SM threading on one side and external SM threading on the other, are available for Ø1/2", Ø1", and Ø2" optics. The mount holds an optic securely with the included retaining ring and can be post mounted to a Ø1/2" Post. The internal threading is deep enough to hold most unmounted optics, while the external threading is deep enough to mount lens tubes, irises, or other internally threaded SM components (see picture to the right). These mounts provide a compact solution to mount multiple SM-threaded components on a single post.
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These mounting rings feature internal SM05, SM1, or SM2 threading that extends the full length of the mount without any retaining lip. They are perfect for mounting lens tubes and mounted optics, and can also be used to hold unmounted optics when used with two retaining rings (sold separately below).
![]() ![]() Click to Enlarge LA1116 Lens Epoxied into an LMRA6 Adapter Using NOA61 Epoxy; the Mounted Lens Was Then Placed in the LMR05 Mount
Thorlabs' small-optic mounting adapters are designed to mount non-standard optic sizes into Ø1/2" or Ø18 mm Mounts. Each stainless steel adapter includes two or three reservoirs next to the lens cell to secure the lens in place with General Purpose or UV Curing epoxy. Simply place a drop or two of adhesive into each reservoir located next to the lens in the adapter. We recommend using our NOA61 UV curing adhesive and MS403-10 epoxy syringe. The Ø1/2" Optic Mounting Adapters featured below are compatible with our LMR05 (LMR05/M) or MLH05 (MLH05/M) Lens Mounts, SM05 Lens Tubes, or 16 mm Cage Components. The LMRA10 is compatible with our LMR18 (LMR18/M) mount, AD18T adapter, or SM1AD18 adapter. Once the optic is secured in the small-optic adapter, the new assembly is held in one of these threaded mounts using an SM05RR or SM18RR Retaining Ring. Thorlabs also offers an extensive line of adapters for unmounted optics which allow optics ranging from Ø2 mm to Ø2" to be mounted in our fixed optic mounts.
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These Retaining Rings are replacements for those that are provided with our fixed lens mounts featured above. Two retaining rings are required for mounting optics in the fixed lens mounts with no retaining lip (item # SMRx). We also offer stress-free and plastic retaining rings for our Ø1.0" lens mounts, and retaining rings in additional sizes on our main Retaining Rings page. For ordering convenience, our Ø1/2" and Ø1" Retaining Rings, the SM05RR and SM1RR, are available in packs of 10, and our Ø2" Retaining Ring, the SM2RR, is available in packs of 5. ![]() ![]() Click to Enlarge These alignment plates slide over the fixed lens mounts sold above to create a mounted alignment target.
These alignment targets can be quickly and easily dropped onto one of our fixed lens holders or lens tubes allowing the user to align a visible beam using the center Ø1 mm through hole. Once the beam is aligned, the tool can be lifted from the lens holder or lens tube without disturbing the alignment and can later be replaced into approximately the same position. For optimal visual alignment of the beam, these plates feature laser-engraved concentric circles, with the diameter of each circle being 2 mm greater than the previous.
![]() ![]() Click to Enlarge Stackable spanner wrenches, like the SPW603, can be fitted together to reach retaining rings in long lens tubes. ![]() Click to Enlarge An SPW602 spanner wrench is used to place an optic in a lens tube via a retaining ring. This spanner wrench features an engraved scale to indicate spanner wrench depth.
These spanner wrenches enable adjustment or installation of many of our standard retaining rings. The hollow construction of each spanner wrench allows the retaining ring to be adjusted without obscuring the beam path. They feature knurled handles for improved grip as well as flanges to keep the retaining ring on the end of the spanner wrench while inserting or removing the ring. As shown to the right, the SPW602 features an engraved scale to indicate spanner wrench depth in both imperial and metric increments (0.1" and 0.5 mm, respectively), thereby enabling precise positioning of optics. For retaining rings not covered by these cylindrical spanner wrenches, please see the SPW801 Adjustable Spanner Wrench sold at the bottom of the page. The SPW801 features an adjustable spanning range as well as long blades that extend 1.6" (40.7 mm) from the body of the wrench. Hence, for lenses with a high radius of curvature, we recommend using the SPW801 over the cylindrical spanner wrenches, whose guide flanges may come into contact with the lens.
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Thorlabs' Adjustable Spanner Wrench features a spanning range that is continuously adjustable from 0.12" to 2.89" (3.0 mm to 73.4 mm). It is capable of providing an exact fit for retaining rings as large as the SM3RR for Ø3" Lens Tubes and Mounts. The diameter spanned by the blades remains centered while the knurled knob is adjusted. The reversible blades have a flat tip on one end intended for use with retaining rings, and an edge-offset fine point on the opposing end for adapters with holes. The blades extend 1.6" (40.7 mm) from the body of the wrench. Hence, compared to our cylindrical spanner wrenches sold above, the SPW801 is ideal for securing lenses with a high radius of curvature because the guide flanges on the cylindrical spanner wrenches may come into contact with the lens. To reverse the blades, a 0.050" (1.3 mm) balldriver or hex key is needed. Replacement blade pairs are available separately. The SPW801 wrench withstands a maximum torque of 80 inch-pounds (9 N·m). | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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